Annual report pursuant to Section 13 and 15(d)

Warrants - Additional Information (Details)

v3.21.1
Warrants - Additional Information (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 8 Months Ended 12 Months Ended
Nov. 30, 2020
USD ($)
$ / shares
shares
Jul. 20, 2020
USD ($)
director
$ / shares
shares
Jun. 24, 2020
USD ($)
director
$ / shares
shares
Mar. 17, 2020
$ / shares
shares
Dec. 19, 2019
$ / shares
shares
Nov. 04, 2019
$ / shares
shares
Sep. 17, 2019
$ / shares
shares
May 06, 2019
$ / shares
shares
Dec. 31, 2020
USD ($)
shares
Oct. 31, 2020
USD ($)
$ / shares
shares
Sep. 30, 2020
$ / shares
shares
Jun. 30, 2020
$ / shares
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
Jun. 01, 2020
shares
Class of Warrant or Right [Line Items]                                  
Warrants outstanding, intrinsic value | $                 $ 23,800       $ 23,800 $ 12,200 $ 23,800 $ 12,200  
Warrants acquired (in shares)               712,823                  
Warrants acquired, weighted average exercise price (in dollars per share) | $ / shares               $ 3.90                  
Warrants issued (in shares) 400,000 200,000 1,000,000 1,003,232 937,500 11,000         570,258 1,990,624   17,414,030 49,928,469    
Warrants, exercise price (in dollars per share) | $ / shares $ 1.00 $ 1.05 $ 1.25 $ 1.62 $ 5.00 $ 5.00         $ 0.65 $ 0.75          
Warrants, modified exercise price of existing warrants (in dollars per share) | $ / shares     $ 4.25 $ 1.62             $ 0.65 $ 0.75          
Warrants exercised (in shares)                         1,687,690 1,144,999 1,937,690    
Warrants expired (in shares)                 2,512,321           5,470,655    
Warrant term 72 months   84 months   24 months 24 months                      
Warrants exercised (in dollars per share) | $ / shares                           $ 3.50 $ 0.58    
Increase in fair value of warrant | $     $ 100                       $ 24,898 $ 0  
Number of warrants converted (in shares)                                 1,041,666
Number of individuals received warrants | director   2 2                            
Shareholder Guaranties                                  
Class of Warrant or Right [Line Items]                                  
Warrants, fair value | $                 $ 4,200       $ 4,200   4,200    
General and administrative expenses                                  
Class of Warrant or Right [Line Items]                                  
Total cost of contract termination | $                             5,700    
General and administrative expense for warrants issued for services | $ $ 100                                
Warrant Exercise Period One                                  
Class of Warrant or Right [Line Items]                                  
Period from issuance date after which warrants become exercisable             12 months                    
Warrant Exercise Period Two                                  
Class of Warrant or Right [Line Items]                                  
Period from issuance date after which warrants become exercisable             18 months                    
Exercise Price $5.00                                  
Class of Warrant or Right [Line Items]                                  
Warrants, exercise price (in dollars per share) | $ / shares         $ 5.00                        
Broker                                  
Class of Warrant or Right [Line Items]                                  
Warrants issued (in shares)               220,539                  
Warrants exercised (in dollars per share) | $ / shares               $ 3.00                  
Advisor | Exercise Price $0.10 | Warrant Exercise Period One                                  
Class of Warrant or Right [Line Items]                                  
Warrants issued (in shares)             2,500,000                    
Warrants exercised (in dollars per share) | $ / shares             $ 0.10                    
Warrants exercisable (in shares)             1,250,000                    
Advisor | Exercise Price $0.10 | Warrant Exercise Period Two                                  
Class of Warrant or Right [Line Items]                                  
Warrants exercised (in dollars per share) | $ / shares             $ 0.10                    
Warrants exercisable (in shares)             1,250,000                    
Advisor | Exercise Price $10.00 | Warrant Exercise Period One                                  
Class of Warrant or Right [Line Items]                                  
Warrants issued (in shares)             1,500,000                    
Warrants exercised (in dollars per share) | $ / shares             $ 10.00                    
Advisor | Exercise Price $10.00 | Warrant Exercise Period Two                                  
Class of Warrant or Right [Line Items]                                  
Warrants exercised (in dollars per share) | $ / shares             $ 10.00                    
Warrants exercisable (in shares)             1,500,000                    
PIPE Transaction                                  
Class of Warrant or Right [Line Items]                                  
Warrants issued (in shares)               5,744,991                  
Warrant term               24 months                  
Warrants exercised (in dollars per share) | $ / shares               $ 4.25                  
Series F Preferred Stock                                  
Class of Warrant or Right [Line Items]                                  
Adjustment to additional paid-in capital for discount on preferred stock | $                   $ 14,600              
Series F Warrants                                  
Class of Warrant or Right [Line Items]                                  
Warrants issued (in shares)                   43,403,130              
Warrants, exercise price (in dollars per share) | $ / shares                   $ 0.75              
Warrant term                   72 months              
Increase in fair value of warrant | $                             $ 24,898    
Guarantor Warrants                                  
Class of Warrant or Right [Line Items]                                  
Warrants issued (in shares)         6,500,000                        
Warrants, exercise price (in dollars per share) | $ / shares         $ 1.82                        
Warrant term         24 months                        
June 2020 Warrants                                  
Class of Warrant or Right [Line Items]                                  
Warrants issued (in shares)     1,000,000                            
Warrants, exercise price (in dollars per share) | $ / shares     $ 1.25                            
Warrant term     84 months                            
July 2020 Guarantor Warrants                                  
Class of Warrant or Right [Line Items]                                  
Warrants issued (in shares)   300,000                              
Warrants, exercise price (in dollars per share) | $ / shares   $ 1.05                              
Warrant term   84 months                              
Share-based compensation expense | $   $ 1,000